ARPES on Na0.6CoO2: Fermi surface and unusual band dispersion.

نویسندگان

  • H-B Yang
  • S-C Wang
  • A K P Sekharan
  • H Matsui
  • S Souma
  • T Sato
  • T Takahashi
  • T Takeuchi
  • J C Campuzano
  • R Jin
  • B C Sales
  • D Mandrus
  • Z Wang
  • H Ding
چکیده

The electronic structure of single crystals Na0.6CoO2, which are closely related to the superconducting Na0.3CoO2.yH(2)O (T(c) approximately 5 K), is studied by angle-resolved photoelectron spectroscopy. While the measured Fermi surface (FS) is consistent with the large FS enclosing the Gamma point from the band theory, the predicted small FS pockets near the K points are absent. In addition, the band dispersion is found to be highly renormalized, and anisotropic along the two principal axes (Gamma-K, Gamma-M). Our measurements also indicate that an extended flatband is formed slightly above E(F) along Gamma-K.

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عنوان ژورنال:
  • Physical review letters

دوره 92 24  شماره 

صفحات  -

تاریخ انتشار 2004